14_Glaciers[1]

14_Glaciers[1] - Glaciers Glacier Formation/Distribution...

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1 Glaciers Glacier Formation/Distribution • Glaciers form where more snow falls than melts (snowfall > melt) • Global distribution = 95% of glaciers are found on Antarctica and are found on Antarctica and Greenland – found on every continent except Australia • Ultimate source and fate of water in glaciers?
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2 air bubbles Glacial Ice Under the Microscope Accumulation and Ablation Accumulation – the addition of snow/ice to glacial system Ablation – the loss of glacial ice Ml t i fl i Melting of glacier Calving of ice into oceans Sublimation
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3 Ablation Accumulation
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4 Grinnell Glacier, MT 1938 1981 2005 Easton Glacier (WA) retreated 255 m from 1990 to 2005. Internal Glacial movement (ice flow) • Ice is both brittle and ductile –Differential flow velocity creates tensional stress Crevasses form as a result of differential flow • Generally form at ~right angle to flow
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5 Glacial movement
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6 seasonal = facilitated by liquid water
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7 Bering Glacier: surged 1 mile in 3 weeks (1993) continental glacier continental glacier
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8 Determining past climate using glacial ice valley glaciers
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9 valley glaciers Flow velocity
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This note was uploaded on 05/15/2008 for the course GEOL 101 taught by Professor Kendall during the Spring '07 term at Clemson.

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14_Glaciers[1] - Glaciers Glacier Formation/Distribution...

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